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Charge Carrier Generation and Transport in Different Stoichiometry APFO3:PC61BM Solar Cells

Pranculis, Vytenis; Infahsaeng, Yingyot LU ; Tang, Zheng; Devizis, Andrius; Vithanage, Dimali LU ; Ponseca, Carlito LU ; Inganas, Olle; Yartsev, Arkady LU ; Gulbinas, Vidmantas and Sundström, Villy LU (2014) In Journal of the American Chemical Society 136(32). p.11331-11338
Abstract
In this paper we studied carrier drift dynamics in APFO3:PC61BM solar cells of varied stoichiometry (2:1, 1:1, and 1:4 APFO3:PC61BM) over a wide time range, from subpicoseconds to microseconds with a combination of ultrafast optical electric field probing and conventional transient integrated photocurrent techniques. Carrier drift and extraction dynamics are strongly stoichiometry dependent: the speed of electron or hole drift increases with higher concentration of PC61BM or polymer, respectively. The electron extraction from a sample with 80% PC61BM takes place during hundreds of picoseconds, but slows down to sub-microseconds in a sample with 33% PC61BM. The hole extraction is less stoichiometry dependent: it varies form sub-nanoseconds... (More)
In this paper we studied carrier drift dynamics in APFO3:PC61BM solar cells of varied stoichiometry (2:1, 1:1, and 1:4 APFO3:PC61BM) over a wide time range, from subpicoseconds to microseconds with a combination of ultrafast optical electric field probing and conventional transient integrated photocurrent techniques. Carrier drift and extraction dynamics are strongly stoichiometry dependent: the speed of electron or hole drift increases with higher concentration of PC61BM or polymer, respectively. The electron extraction from a sample with 80% PC61BM takes place during hundreds of picoseconds, but slows down to sub-microseconds in a sample with 33% PC61BM. The hole extraction is less stoichiometry dependent: it varies form sub-nanoseconds to tens of nanoseconds when the PC61BM concentration changes from 33% to 80%. The electron extraction rate correlates with the conversion efficiency of solar cells, leading to the conclusion that fast electron motion is essential for efficient charge carrier separation preventing their geminate recombination. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of the American Chemical Society
volume
136
issue
32
pages
11331 - 11338
publisher
The American Chemical Society
external identifiers
  • wos:000340442700029
  • scopus:84906091701
ISSN
1520-5126
DOI
10.1021/ja503301m
language
English
LU publication?
yes
id
43efd1b0-5530-46a4-b42d-ce2596e3610e (old id 4656326)
date added to LUP
2014-09-24 14:18:03
date last changed
2017-11-05 03:53:06
@article{43efd1b0-5530-46a4-b42d-ce2596e3610e,
  abstract     = {In this paper we studied carrier drift dynamics in APFO3:PC61BM solar cells of varied stoichiometry (2:1, 1:1, and 1:4 APFO3:PC61BM) over a wide time range, from subpicoseconds to microseconds with a combination of ultrafast optical electric field probing and conventional transient integrated photocurrent techniques. Carrier drift and extraction dynamics are strongly stoichiometry dependent: the speed of electron or hole drift increases with higher concentration of PC61BM or polymer, respectively. The electron extraction from a sample with 80% PC61BM takes place during hundreds of picoseconds, but slows down to sub-microseconds in a sample with 33% PC61BM. The hole extraction is less stoichiometry dependent: it varies form sub-nanoseconds to tens of nanoseconds when the PC61BM concentration changes from 33% to 80%. The electron extraction rate correlates with the conversion efficiency of solar cells, leading to the conclusion that fast electron motion is essential for efficient charge carrier separation preventing their geminate recombination.},
  author       = {Pranculis, Vytenis and Infahsaeng, Yingyot and Tang, Zheng and Devizis, Andrius and Vithanage, Dimali and Ponseca, Carlito and Inganas, Olle and Yartsev, Arkady and Gulbinas, Vidmantas and Sundström, Villy},
  issn         = {1520-5126},
  language     = {eng},
  number       = {32},
  pages        = {11331--11338},
  publisher    = {The American Chemical Society},
  series       = {Journal of the American Chemical Society},
  title        = {Charge Carrier Generation and Transport in Different Stoichiometry APFO3:PC61BM Solar Cells},
  url          = {http://dx.doi.org/10.1021/ja503301m},
  volume       = {136},
  year         = {2014},
}